Yes, I have owned the MicroZotl for about 6 months. I have the Stage II upgrade.
I conducted an exhaustive search of tube preamps and found about 4 or 5 reviews of the Micro on non-mainstream outlets.
The Audiophiliac did a review (after I bought mine) and it is now his reference Pre-amp.
I was interested in a tube preamp which was neutral but fills out the “correct sound” matched with SS Amp (Bryston) needed to drive my LRS+.
On well recorded music (even with a digital front end) the combination sounds purely live.
IMO the preamp is clear, clean and imparts little to no discernible signature.
The company is small but has been very responsive to provide support when I cracked a tube or had any questions.
I do not work for the company.
In retrospect I must admit it was very anxiety producing to consider paying this amount for something I could only find little about. In addition, what could be found was seemingly “overwhelmingly positive (IMO)”
I took a chance and it worked very well for me. YMMV